From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D73C2D3F084 for ; Wed, 28 Jan 2026 15:56:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 10A5810E727; Wed, 28 Jan 2026 15:56:24 +0000 (UTC) Received: from bmailout2.hostsharing.net (bmailout2.hostsharing.net [83.223.78.240]) by gabe.freedesktop.org (Postfix) with ESMTPS id 87E1A10E72C; Wed, 28 Jan 2026 15:56:22 +0000 (UTC) Received: from h08.hostsharing.net (h08.hostsharing.net [83.223.95.28]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) server-digest SHA384 client-signature ECDSA (secp384r1) client-digest SHA384) (Client CN "*.hostsharing.net", Issuer "GlobalSign GCC R6 AlphaSSL CA 2025" (verified OK)) by bmailout2.hostsharing.net (Postfix) with ESMTPS id 57D162009D01; Wed, 28 Jan 2026 16:56:21 +0100 (CET) Received: by h08.hostsharing.net (Postfix, from userid 100393) id 43F1435135; Wed, 28 Jan 2026 16:56:21 +0100 (CET) Date: Wed, 28 Jan 2026 16:56:21 +0100 From: Lukas Wunner To: Atharva Tiwari Cc: Ard Biesheuvel , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , David Airlie , Simona Vetter , Javier Martinez Canillas , Thomas Zimmermann , Lenny Szubowicz , Ingo Molnar , Francesco Pompo , linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: Re: [PATCH v2 0/2] Add support for eGPUs on Apple Products Message-ID: References: <20260128145855.1071-1-atharvatiwarilinuxdev@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260128145855.1071-1-atharvatiwarilinuxdev@gmail.com> X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Wed, Jan 28, 2026 at 02:58:36PM +0000, Atharva Tiwari wrote: > This series adds support for eGPUs on Apple products, by > enabling apple-set-os on all apple devices. > > A side effect of this patch is that the iGPU becomes enabled on iMacs. > However, iMacs can’t use the iGPU to drive the display > (They can't link-train the internal display), > so displays must be disabled on iMacs. Oh there's the explanation that should have been in the commit message of patch [2/2]. It's possible that the iMac has a multiplexer built-in which can switch between the iGPU and dGPU at runtime. Please ensure that you have set CONFIG_APPLE_GMUX=y in your .config, the gmux driver should bind to the multiplexer if there is one. If there is a multiplexer built-in, then disabling the iGPU is the wrong approach. Thanks, Lukas